Cold pier main recruitment

It is better to use thermal expansion inserts, so that the jacket can better protect the mold core. The mold core is not easy to crack, and the service life of the mold is longer. Using thermal expansion method, the interference is large, the die sleeve and the die core are tightly clamped, and the die core is not easy to crack. Cold-pressed interference sleeves are commonly used, and the interference ratio is small, generally around 0.03 ~ 0.05 mm If it is larger, it is easy to shovel off the skin. Using the method of thermal expansion, the interference is relatively large, generally above 0.13 mm. The interference is selected according to the specific size, and the larger the diameter, the greater the surplus. The interference of 3.50mm diameter is different from that of 100mm diameter.